To recline the seatback, lean forward slightly and lift the lever. Then lean back to the position desired and release the lever. To return the seatback to its normal upright position, lean forward and lift the lever. Release the lever once the seatback is in the upright position.

Recline Lever

WARNING!
Do not ride with the seatback reclined so that the shoulder belt is no longer resting against your chest.

In a collision you could slide under the seat belt, which could result in serious injury or death.